Chucking machine



April -13, 1937. R. 5. BROWN ET AL 2,077,093

. CHUCKING MACHINE I Filed Aug. 29, 1934 10 Sheets-Sheet 1 April 13, 1937, h. 5'. BROWN ET AL 3,077,093

CHUCKING MACHINE} Filed Aug. 29 1934 l0 Sheets-Sheet 3 ATTORN EYS Alliril 1937- R. 5. BROWN El AL 2,077,093

' CHUCKING MACHINE Filed Aug. 29, 1954 10 Sheets-Sheet 4 April'--13, 1937.

R. 5. BROWN El AL CHUCKING MACHINE 10 'Shets-Sheet 5 Filed Aug. 29, 1934 ATTORNEYS R. s.- B'RQWN' ET AL 2,077,093 .CHUGKING MACHINE.

' April 13, 1937;

Filed Aug. 29, 19:4 10 Shets-Sheet e 'INVENTORS Bmw 57ml ATTORNEYS .April 13, 1937.

R. 5. BROWN ET AL CHUCKING MACHINE Filed Aug. 29, 1934 10 Sheets-Sheet 7 5 R O T N INVE Brawn r2 ZSmzt/z W ATTORN EYS April 13, 1937.

R. 5. BROWN ET AL CHUCKING MACHINE.

Filed-Aug. 29, 1934 1O She ets-Sheet' 8 VENTORS i & g0 enflfroggg ATTO R N EYS April 13, 1937.

R. 5. BROWN ET AL 'CHUCKING MACHINE Filed Aug. 29, 1934 10- Sheets-Sheet 9 INVENTORS JYBmwrz JFaer Flwgn]? S m z'tiz A ORNEYS April 13, 1937. R. 5. BROWN ET AL 2,077,093

CHUCKING MACHINE Filed Aug. 29, 1954 10 Sheets- Sheet 10 d Hill/ 1 llllln Illll Zaert E 0232 R 5 mm Patented Apr. 13, 1937 assignments,

puny, New B Connecticut I 1..

Etc The New Britain Machine Comiitain, -Oonn., a corporation of Application {mar 29,- 1934. Serial .No. 741,890.

' 4i (Gaza-3s) Our invention relates to, and will be de's'cribed as embodied in, a chucking machine, but it is'to be understood that various features of the invention are applicable to machines of'other types. In general, it is the object of theinvention' to improve several featuresof a machine of the character indicated, with a view to an-increase in speed and accuracy of the machine and'to facilitating various changes usually finade or'dem sirable to be made in such machines.

It is a specific object to provide-spindle feed mechanism providing for wide rangelof adjustment of feed with but few cams,'-andjwhich al-'-.

ways permits complete spindle avoids undue overhangs It'is another specific obiectftoprovide an ini- In said drawings which show, for illustrative purposes only, a preferred form of the inventionas embodied in a two spindle chucking machine -'of the tool rotating type- Fig. 1 is a view in front elevation of a machine f embodying features of the invention;

' Fig. 2 is a rear view. in elevation of the machine shown in Fig. 1;

' machine shown in 3 Fig. 3 is a front view of the left hand end of the shown in section and some parts omitted for the retraction. and v 1 right, h d end of the machine shown in sake of illustration;

Fig.4 is a view similar to Fig. 3 but showing I Fig proved threading mechanism, whichmechanisin in addition to facilitating the accurate -iforming of threads, is readily changed over for cutting either right or left hand threads.

leader mechanism and means for v jumping the threading tool to the work. 9

Another specific object is to provide improvedindexing means particularly advantageous in con nection with anindexible member having rela- Fig. 5 is asectional view taken substantiallyin the planeof the line 5-5 of Fig. 3;

Fig. 6 is a detail sectional view taken substa v tially in the plane of the line 66 of Fig. 5;- It is a further object to provide improvedthread Fig. "lis a detail view of a modified form of gearing for driving both spindles synchronously for threading;

Fig. 8 is a sectional view taken substantially I in theplane of the line B -B of Fig. 3;

'tively few index positions and one having wide axial adjustment. 3

Another specific object is to provide an improved fluid pressure chucking mechanism without undulyincreasing the length or weight of the indexible member. y

Another object is toprovide improved fluid pressure chucking mechanism in which leakage is reduced to a minimum and upkeep costs re-' duced. I Another object is to provide improved-means for actuating fluid pressure actuated chucks so as to readily reverse the actuation thereof for gripping either the outside or the inside; of a work piece.

Another specific object is to provide improved of Fig. 8;

Fig. 9 is an enlargedfragmenta'ry detail view takensubstantially in the plane of the line 9-4 Fig. 10 is a sectional view taken substantially in the plane of the line l0l0' of Fig. 4;

means for directing cutting oil or other coolant onto the work. A further object is to for preventing splash'of the cutting oil or other coolant during operation otthe machine and yet machine. 0 7. V

Other objects and various features of novelty and invention will be either hereinafter pointed 'out or will become apparentfto one skilled in the art upon a reading of the speciflcation taken in connection with ,the drawings.

provide improved means Fig. 11' is an enlarged detail sectional view taken substantially in the plane of the line] -i I of Fig. 4; v

'Fig. 12 is a sectional view takensubstantially in the plane of the line I2 -l2 of Fig. 4; I

Fig. 13 is a sectional view of the chuck-cylinder group taken substantiallyin the plane of the line lala of Fig.4;

Fig. 14 is a composite sectional view of a cylinder and associated parts taken substantially in the planes of the lines It, N and 1490f Fig. 16

Fig. 1-up to the dot-dash line, the front wall being broken away and some parts and illustrating the chucking cylinder connece 'tions at the three section planes noted;

Fig. 15 is an enlarged sectional view of a cylin der and piston device foractuating a chuck, taken substantially in the plane 'of the line l5- I5 of,v

16; e which provides for unobstructed operation of the Fig. 16 is a view in elevation of a chuck cylinder illustrating valve passages and fluidpressure inlet and outlet ducts, etc.; Fig. 17 is an enlarged top plan view in partial section'of the turret stem or bar andillustrates a fluid distributor and various ducts and passages to the chucking cylinders:

in Fig. 17;

Fig. 20 is a sectional view ofa coolant diversion valve shown in place in Figs. 2'and 21 Fig. 21 is a sectional view taken'substantially in the plane of the line 2 |--2| of Fig. 3;

Fig. 22 is a fragmentary view in side elevation of acoolant pipe and housing parts shown in Fig. 21, certain cover caps being removed toillustrate gearing, and parts being shown in section.

Briefly stated, in the preferred form of the invention illustrated, the machine may consist of a frame I comprising a spindle end 2 and" a turret end 3. The machine illustrated has two rotating spindles and an. indexible turret having three chucks indexible successively from loading station into work stations'in oppositioh to the rotating tool spindles. may be arranged for machining, drilling, reaming, etc., and one or both of the spindles may be arranged forthreading. Rotation of the threading spindle is preferably accomplished by a rack and pinion device to be more fully described. An improved thread leader mechanism is preferably employed for jumping'the threading tool to and from the work and for leading the threading tool.

The spindle or spindles, when not employed for threading, may be fed by an improved spindle shift lever preferably arranged to variously adjust the stroke when employing the same cam.

The chucks are preferably fluid pressure actuated and various improvements are embodied in a fluid pressure actuating mechanism which tend to reduce leakage, facilitate inspection and repair, and generally shorten and lighten the ;inde'xible mass movable with the turret. adjustable toward and from the tools and the turret locking and clamping mechanism moves with the turret.

The turret, with its indexing parts, is indexed in all axially adjusted positions by a modified Geneva motion so arranged as to cut down the normal speed of index when the index roll is or would be normally nearest the.

coolant. The housing mechanism and coolant directing mechanism are preferably movable together so as to house the work and direct coolant and so as to stop the flow of coolant and withdraw the housing so as to permit proper indexing, inspection, etc. Various features, as above noted. and others to be hereinafter described, need not all be employed in the same machine and may be advantageously employed in machines of other types, for example, machines in which the turret feeds up to the tools, and inmachines in. which the chucks rotate and the tools may be stationary:

. The motive power for the machine is preferably a; motor 4 housed in the base of the frame I and driving the shaft 5 as by means of a chain -6. The shaft 5 (Figs. 3 and 5). carries a spur gear 1 which meshes with a gear 8. Carried with the gear 8 is a gear 9 which in turn meshes with the spindle drive gear l shown also and more in detail in Fig. 9. Two or more of the gears mentioned are change gears to provide for-various spindle speeds.

' The spindle driven by the gear "I, is mounted in a front bearing in the frame, while at the rear the spindle is carried by a sleeve l2 splined thereto, which sleeve has the drive gear) keyed One or both of the spindles The turret is thereon. The sleeve is mounted in an anti-friction bearing i3 as shown more particularly in Fig. 9. Thus, the spindle may be rotated at the. required speed, and due to its splined connection with the sleeve I2, may be fed and retracted by suitable means such as the improved shift lever to be described. The front spindle hearing may be substantially the same as the rear bearing just described.

The shift lever l4 shown more particularly in Figs. 8 and 9, and shown in dot-dash lines in Fig. 3, may comprise a yoke having gudgeons |6|6 fitted into suitable bearing openings in the shift collar ll carried upon an anti-friction bearing It on the spindle The bearing shown is designed to take both radial and thrust loads so that the force'for feeding the spindle transmitted through the shift lever ll istaken by the bearing itself. In effect, the shift lever |4,'

through the gudgeons I6, is hung or suspended directly from the spindle itself. The shift lever i4 is iuicrumed on a shackle or link mechanism I9 pivotally mounted at on the frame of the machine and secured at the opposite end to'a fulcrum pin or block 2|. The shift lever I4 is provided with slideways 22 zz and the fulcrum cated at 25.. The fulcrum pin 2| is held in the desired adjusted position lengthwise of the lever It by means of an adjusting bolt. 26 passing lengthwise through the upper part of the lever It and threaded into the fulcrum pin 2| at 21. Therefore, when it is desired to change the ful-' crum point of the shift lever II, the securing bolt 24 is loosened so as to free the fulcrum pin from the slideways 22, after which the adjusting bolt 26 may be turned to move the fulcrum pin up or down to the desired adjusted position,

after which it is held in such adjusted position by again taking up on the securing bolt 24. The lower end of the lever H is provided with a cam roll 28 to be'engaged by a suitable face cam 29, as shown more particularly in Figs.) and 22. If desired. a draw back cam 20 may be employed for retracting thev spindle. Means such as a compression spring 3| is preferably employed for constantly urging the shift lever II in a direction to retract the spindle and it will be clear that. since the shift lever is hung from the spindle itself and oscillates about the fulcrum pin, the spindle wilialways be retracted tothe maximum extent permitted by the feed cam 29 or other stop for the spindle and-the spindle overhang is reduced to a minimum. By means of by shifting the link IS with but little change in spindle position, as the path of the fulcrum pin 2| is tangent to the arc of link is when spindle is so retracted. Also that cams of differentrise may be substituted for cam 29 without change in the return cam 30, which will'always compel retraction should fail. v A-threuding spindle 22 (in this casethe rear of spindle if spring means 3| spindle) is mounted in suitable bearings in the frame and in order to provide for an interchangeable threading and machining spindle the spindle bearing arrangement may be the same I extreme .accuracy in thread cutting isshown in or similar-to that heretofore described in connection with the front spindle ll, though when the spindle 32 is arranged for threading its drive gear would be removed or disconnected from any drive from the motor. Improved means for ro-- tating the threading spindleand providing for Figs. 3,5and6. a

The threading spindle drive originates in-the main drive shaft 5 and through bevel gear 33 power is transmitted to sh'aft 34 (Fig: 8). Then',

through suitable gearing,-,including change gearing in housing 35 (see also Fig. 22), power is finally transmitted to the worm shaft." cargar 3.8.

It is tobe understood that a main fee interposed between the main drive rying the worm 31 meshing with wor 5 clutch 1-.

and' other drives having to do with the feed works. Shch clutch is controlled by the usualfeed ,clutch lever as will bereadily understood. From worm gear 38 power is transmitted through shaft 39 to a spur gear 40 meshing with aspur gear 4| onshaft 42., Shaft 42 carries avariable speed gear, such 'as an elliptical gear 43, which.

- in turn meshes with and drives a corresponding elliptical gear 44 on shaft 45. Carried integrallywith'elliptical gear ou shaft 45 is a crank disk 46 which adjustably carries a crank pin 41 for'driving a connecting rod type of rack. 45. The length of the crank may be varied by the adjusting screw mechanism 49 *as clearly shown 'in Fig. 5. a

Rack 48 engages and drivesa pinion 50 loosely mounted-upon a shaft carried in suitable bearings in .the frame and in removable cover plate '52. Thus, when the'crank is rotated so as to Y reciprocate the rack, thepinion 50 is rotated in with an internal gear 55. fixedly carrLed in a "frame bearing boss 56. .Within the cluster'of forward. and reverse directions. The rotation of the pinion 50 ismultiplied by suitable means-v so as to multiply the rotation of the threading spindle ultimately driven by the mechanism just described. The multiplying means employed in the preferred form comprises a generally planetary type of transmission shown especially in Figs. 5 and.6. The pinion 50 carries a spider 53 andcluster gears 54-54. The gears 54 mesh gears 54 and meshing therewith is'a pinion 51 on shaft 5|. Shaft 5| .at its right hand end as viewed in Fig.6 carries a threading spindle drive.

gear 58 which in turn meshes with a pinion 58 carried by and driving the threadingspindie,

The pinion 51 is slidable endwise towards the left from the position shown in Fig. 6 so that .when the securing nut for the gear 58' is removed a the shaft 5| or the pinion 51 carrying the gear 58 maybe moved towardsthe left so as to strip the gear 58 from its drive and permit its edgewise removal so that the gears58-59 maybe removed and other change gears substituted.

It will be seem therefore, that the rotation of the rack pinion 50 may be multiplied t6 the de-- .65

sired extent by the planetary type oftiansinission. and change gears- Ute-59. Furthermore,

'withouttheemployment of change gears, the rotation of the pinion 50' may be increased '01- de creased by yarying the. length of, the crank arm, as heretofore described.

- If the crank were driven directly by spur gears.

there would be the well'known harmonic motion transmitted to the rack. However. it 'is' desir ,able 'tdprovide'a substantially constant running.

fan speed and-a; considerably accelerated rim-.

aft 5 and. the ultimate threading spindle drive, index drive,

ning of! speed of the threading tool. By the employment of theelliptical gear drive for the'rack v crank the running on speed may be made substantial'ly constant and the running off speed may be greatiy'accelerated'and during such motion the running on time is, of course, much longer than the running off time, asdt should be.

With the parts arranged as shown forexampie in Fig. 5 the threading spindle 32 will be rotated in one direction for cutting threads of one hand. In order to cut threads of the opposite hand the rack 48 may be remo ed from the crank more to be noted that,- regardless ofthe length of the crank arm, which determines the number of rotations of the pinion 50, the ratio of the runnlng on time to the runningofi time will rack to cut threads of the other hand, it will be clear that the same result may beaccomplished by simply reversing the position of the crank pin on the crank, that is, by loosening the holding gib and reversing the dovetail slide (Fi s. 3 and be precisely the same. Instead of reversing the 6) carrying the crank pin 41 so as to pos tion the crank pin'180 from its present position.

If it is desired to employ both the spindle 32 and the spindle II as threading spindles, 'a connecting gear Bi may be interposed between the spindle drivegears 59 and I0, as shown more particularly in Fig. 7. Thus both spindles may ,be rotated by the rack' and pinion mechanism described and inthe same direction but not, needriven gears onspin le H from that on "32 as shown in Fig. '7, where gear 59 is smaller than gear II), the latter .will make fewer turns and hence at slower speed. If reverse directions of the two spindles are desired, for example when cutting threads of opposite hand by the two spindies, an idler may be interposed in the train shown in Fig. 7, and in any event if the two spindles are driven by the rack and pinion-mechanism, the ratio of the running oil to the running on time is always the same, regardless of the hand of thethredd being cut or the number of turns of either spindle. I

- It may benoted at this point that if it is desired to employ both spindles'as machining spin,- dies instead of a threading spindle or asone threading spindle and one machining spindleg the two. spindles may be geared together and-.1.

driven "by-the gear train heretofore described .essarily at same speed or making the same num- I ber of turns, for by employing diiferentsized in connection with the driving of the spindle ll or a separate train of gear! all starting from the drive shaft 5. It may also here be notedthat the spindle shift lever may be left in place. whether or not either or both spindlea are employed for machining. .Of course, ifthe spindles are arranged for threadv ing, the'shift levers in'most cases would be rendered inoperative by the removal of at least the feed cam, as.

' In order to feed the threading spindle, it is in us m y be-employed many cases-desirable to use a' thread leader and-p desirable also to jump the threading tool to the worlr andaway fromthe work whendisengaged and 5, we have provided thread leader mechanism and improved means for jumping the threadingspindles or both threading spindles threading spindle is a thread leader slide 0'I which carries one thread leader member, as a leader nut 68, while theopposite thread leader member, as the lead; screw' 09, is carried by the end of the threading spindle. These thread leader members preferably remain always in threaded engagement with each other. In order to jump the threading tool into and from the anism, as is usual in machines of'this type. The I work, the slide 61' is arranged to be slid along the slideway and securely held in its forward,

jumped position. In the form shown are improved means for jumping the slide 01, which comprises a toggle I0 fixed to the frame at II and fixed to the movable slide at its opposite end at 12.. The toggle is operated by means of a link I3 and a lever I4. There is preferably 'an adjustable lost motion connection between. .the link I3 and lever I4 so that there may be considerable motion of the lever without affecting the link and toggle for such times as it is desired to provide foronly a slight jump.- The lever 14 is actuated by a link 15 and bell crank lever I6 which is itself rocked by means of a suitable cam 'I'Lmounted upon the shaft 00 or other shaft operating in synchronism with the shaft 45 which drives the rack. When the bell crank is moved so as to break the toggle, it will be clear that through the thread leader mocha nism the slide and threading spindlewill, be rejump is requiredon tap beforeentering work, the.

spindle is then wholly controlled. by the leader screw 09 on same, working in a then stationary leader nut 68..

The cam or cams which are employed for feeding the spindle or spindles when both are arranged for machinin and not for threading, are driven in synchronism with the index mechrdrive for the cam or cams for the'machining spindle or spindles is taken from the shaft 5 through shaft 34 and throughjvarious change gears in the housing 35, and ultimately is to the drive gears 80-00 which carry-cams, & 20, for actuating .the gear shift levers.

The main cam or index shaft 8| is preferably driven through suitai'ble spur gears'carried on the worm wheel shaft 00 and index shaft, which latter extends along the rear to the turret end of the machine which drives the. index and other parts at that end of'the machine.

The turretpre'ferably comprises a generally disk shaped m mber 02, rigidly mounted on a bar or stem, e projecting portions of which will be referred to as a forward turret bar or stem 00 (see also Fig. 9) 'and' a rearwardly ex- 2,017,091! therefrom. As shown particularly in Figs. 3.

tending bar'or stem 04, both said stems being mounted in suitable bearings inv the frame. The forward bar or stem is adjustably held in a hearing in the spindle end of the frame and .may be adjusted by means of the adjusting screw 00, as shown particularly in Fig. 9. Thus, all of the tool thrusts on the turret are taken on the spindle end of the frame where, through the spindles, they originate. 1

The turret is locked and clamped in indexed positions by means substantially like that shown in Brown-Montstream Patent, No. 1,704,032, March 5, 1929. A split turret housing 05 sur rounds the turret and is carried upon a rigid bar 00 slidably mounted in suitable bearings in .the frame. The turret housing carries a clamping ilever 01 pivotally mounted thereon at 90 and which at the lower end has a roll 00 for engagementby a long cam I00 carried on, the-index shaft 0I. An adjustable draw rod I0 I is threaded into or otherwise adjustably secured to the lever 01 and at the other end engages one side of the turret clamp or housing so that when the lever 01 is moved in one direction by the cam I00, the turret housing is unclamped and is aided in freeing the turret by the spring I02. When the lever 01 is in the position illustrated and not moved counterclockwise into clamping position, the

spring I03 acting between a fixed frame, abutment I04 and a nut I05 on pin I06 serves to draw down on the draw rod IOI for rigidly clamping the turret housing about the turret. The turret is provided with locking slots, which in the present case are three in. number since thereare three indexed positions of the turret. A locking bolt I01 carried by the turret housing is arranged to fit in the locking slots for positioning the turret in indexed position. The locking bolt I0'I is actuated by a bell crank lever I00 pivoted to the turret housing at I00 and, actuated by a cam IIO on the index shaft. The locking bolt may be urged inwardly by means of a spring (not shown) and as illustrated is moved to outwardly or unlocking position positively by means of the cam IJ0. The cams are, of course, synchronized so -as to act in properly timed relation to indexing of the turret and other functions of the machine and the,camsare oi" such length' that they may act on the levers in all axially adjusted positions of the turret.

A Geneva motion is highly desirable as an in- .dexing means for a turret, but when there are relatively few indexed positions for the turret, I

such". as three in the present case, generally speaking an ordinary Geneva motion is not suitable because of the very high index speed of the turret at the mid-portion of its index.- A threev slot Geneva motion requires a GO-degree movement of the index arm to move the slotted member 120 degrees (1 station), and the slotted member attains a maximum velocity at its periphery of"6.4 times that of the index arm, due to the fact that the index-roll passes so close to the center of the index disk. We have devised improved In'the one specific form to be described we,

provide means for varying the speed and varying the effective length of the index arm and have simultaneously the minimum speed and mini- ,mum effective length of arm. By periodically ted piember will be disk.

varying the length of the arm, making it shortest at the timeofits' closest approach to the center of the slotted member and slowing the speed 01' the arm by the use: of eccentrically mounted gears .somewhat'after, the manner disclosed in Brown Patent No. 1,833,122, the time of index may be spread over 135 degrees of cam shaft, rotation and the maximum peripheral speed of the slotonly about 1.5 times the speed of an, arm if mounted directly on the camshaft. The above action may be accomplished without sacrificing the truly radial engagement and disengagement of the roll with the slots of the i-ndex In the particular embodiment shown (Figs. 2, 4, 10, 11) the turret or any suitable extension thereof, as the bar 84, carries a Geneva wheel or plate H5, provided with three equidistant slots H6 HG. The .roll H1 for engagement with the slots for indexing the turret is a roll of relatively great length, that is to say, it is of suflicient length to permit engagement.with the slots of the disk H5 during all axially adjusted-positions of the tur- 125 is provided with a radial slot I20, and the boss tam) the index roll characteristic of a ret, The index roll H1 is rotatably carried by and between a pair of arms I I8--I I and the disk H is positioned between those arms. The arms H8 are carried by a bearing hub or boss H9 which, in the'form shown, is itself carried by movable pivot means in the form of an eccentric bearing member I20. The bearing member I is an eccentric, being mounted upon journals I2I'-- I2I at opposite sides, which journals are mounted in suitable frame bearings. For a purpose to .belater described the eccentric bearing I20 is rotated at twice the speed of the index arms 'I I8 and in the opposite direction by means, of drive gear I22 and pinion I23 with interposed idler I22.

The boss H9, .and with it the arms' II8; and index roll H1 are rotated by theindexshaft BI and with a-variable motion. In the form shown,. we employ an elliptical gear I24 on the index "shaft BI and a meshing elliptical gear I25 movable with the boss I I9. As illustrated, the gear I I9 is provided with a slide I21 engageable-in the slot I25 so that when elliptical gear I25 is rotated, the-boss is carried around with it. The 'ellipticalgears are so meshed and the eccentric I20 is so placed that during rotation of the elliptical gears and eccentric (in the opposite direc-,

H6 in a truly radial direction true Geneva motion. During the further rotation of the boss H9 and index roll- I I1, the eccentric I20, rotating at twice the speed of the index shaft 8 I, moves the" pivot point gage in the slot "of the'boss H0 away frbm theiturret axis so that when .the index roll I 60 -to its maximum extent, as indicated in Fig. 11,

' and the speed of the '.tate at a faster rate than the turret axis, the ecroll- H1 downwardlyo nearest the center of the centric will have pulled the turret at mid-index will be reasonable. As the eccentric continues to 1'0- roll H1; will again be moved outwardly so that as it leaves the slot HIi-at the end of the index- 'ing movement, the recession of the roll from the 'slot will be in a truly radial direction. In Fig. -11, the dot-dash line indicates the path of movement of the roll "H1 under the influence o! the elliptical gears shown and the eccentric mounting for the index'arms and roll. By the means disclosed, we obtain all :of the advantages 'of a Geneva index motion, that is, n irmal ap slot by the indexgoll proach and leaving of the chucking mechanism liquid or gas as the motive fluid The form and as to materially shorten end cylinder head I31 and H1 is positioned so as to en-' cylinder when the I1 would normally be index shalft, the

trally drilled to provide a bore I45 therein,

f cylinder :34.

and the smooth action during indexing and at the same time reduce "the speed of indexing at mid-index to areasonable-value.

We. have provided improved fluid pressure which may employ either a arrangement are such and lighten the chuc 'ng mechanism whereby the indexible mass is substantially lighter than similar devices with Other features to facilitate various changes in chucking arrangement, inspection, and repair, etc., have been provided. Inthe turret illustrated, we employ three chucks I which may be of the general form'disclosed in Brown Patent No.1,969,687, August '1, 1934. It is to be understood that various features of the chucking mechanism may be employed with chucks or various types.

The chucks illustrated (Fig. 4) comprise jaws I3I-I3I which are moved-by means of a right and left hand screw I32, as will be understood. The screw I32 may be actuated by elliptical gears I33-I33, as more fully set forth patent. Each chuck is provided with anindividual chucking cylinder I34 (Figs. 4, 15), each preferably made separate from the other so that inspection and repair will be facilitated. In each cylinder I 34 is a piston I35 having a piston rod I36. The piston rod projects through'the tail need not be in fluidtight engagement therewith. A rack I30 is formed on the piston rod and extends as close as necessary to the piston as illustrated more particularlyin Fig. 15. The cylinder head at the tail end comprises a housing for the rack and a bearing for the shaft Hi9 carrying a; pinion M0 meshing with and driven by the rack I38 and secured to and driving one oi. the gears I33. The cylinder head I31, as stated, completely houses when the'piston and-rack reciprocate, the pinion I 40 will be rotated and the chuck jaws I3I moved to open and closed positions. Itwill be clear that by providing the rack directly on the piston rod and permitting the same to. pass into the piston is at the head end of its stroke, the entire assembly is very much shortened, that is, it is e pistonstroke and stuffing-box usually employed about the piston 'rod. Furthermore, the single stuffing-box IM' surrounding a: rotating shaft may be much more readily kept tight and ,is subject to very much less wear than is the ordinary stufling -box surrounding a reciprocating rod.

pressure fluid, and we have devised improvements in the fluid distributing system. The rear turret stem 84', in the form shown (Figs. 16, 11) ,is centhe end of the bore-may be counterliored'to provide a smaller-bore or passage. Ii-extending to a point aboutopposite the tail end of each Threaded ihto the counterbore is a fluid conduit, I41 which is'spaced from the bore I45. Thus, two concentricconduits IlS-I" which we are familiar.;

in said Brown The pistons are -recir irocated, as stated, by

shortened by the length or one and.

are-provided within the rear turret stem 84. As. indicated, thecylinders may be mounted upon a suitable turret extension and fluid connection is made to each cylinder valvev from the conduit I 46-I41 by means of a pipe connection or passage I48, and a second connection I49 is made' an opening and passage I58 leading to the head end of each cylinder. A simple form of cup valve I54 extends over the passages I50, I 5I, I52, and [53, and is actuated by a handle I55 either manually or automatically, e. g., as disclosed in Brown Patent No. 1,833,822; November 24, 1931. The valve I54 is provided with a connecting passage I56, which, in the position shown in Fig. 16, connects the passage ports I50-I52 and is provided with a second connecting passage I51, whicg 1 connects assume pressure; fluid as entering through the inner conduit I41, such pressure fluid would'be conducted through counterbore I46, connection I48, port I50, passage I56, port and passage I52 to the tafl end of the cylinder so that the piston would be driven to the right as illustrated in Fig.

15. While the piston I is moving toward the,

head end, pressure fluid irom the head'end may I escape from such head endthrough' passage I53,

connecting passage I51, passage ,I5I, connection I49, to the outer concentric bore I in the turret bar. When the valve I54 is shifted about 90 from the position shown in Figs. 15 and 16 ina clockwise direction, the various passages will be "reversed, as will be clear; and pressure fluid will thenpass through the pressure-pipes. I41 to the head end of the cylinder and pressure fluid from .passage I69 to pipe I62, which,,

the tail end of the cylinder will escape through exhaust pipe I45, all as will be readily understood. c

either on the outside or inside thereof, we have devised simple means for reversing the flow of fluid through conduits I45, I 41. In the form illustrated (Figs. 1'1, 18, 19) we have provided a reverse valve body I between parts of which is positioned a movable reversing valve disk I6I.

From the body I60 a conduit I62 leads to a ring member I68extending about'the turret bar 84 or a suitable extension thereof and communicates through a suitable passage with the inner conpipe I61 also communicates therewith. There-- versing valve disk I6I is provided with connect ing ports I6,8 -I69. With the valve turned to the position shownin Fig. 19, as bymeans of the small manual handle I10, pressure fluid entering through inlet pipe I66 is conducted through as heretofore stated, communicates with the inner conduit I 41 in the turret bar '84. with the valve inthe same position, the outer conduit i 45 in the turret bar 84 communicates through pipe I64 and passage I66 in the position illustrated in Fig. 16, e passage ports I5I-I53. Thus, if we- In order to provide for chucking work pieces a,o77,oos.

with the exhaust pipe I41, which, when air is the It. is often desirable to reverse the-action of the chucking pistons for actuating the chucks so as L to make it possible to grip work either by'the'inside or the outside. The simplest method-of accomplishing such action is to reverse the pres- ;sure connections to'the various cylinders, and it is {or that reason that we have provided the reverse valve mechanism illustrated in Figs. 17, 18 and 19. When the reverse valve IN is turned by means of the handle I 10 through about 90 in a clockwise direction, it will be clear that the passages I64 and I66 will be connected to. each other, and the passages I62 and I61 will be connected to each other, and therefore pressure fluid would now pass 'into the outer conduit I45 in the turret bar, and inner conduit I41 would then' become the exhaust'conduit. Then, upon actuation of the piston valve by means of the handle I55, the piston will be operated just the reverse of its operation previously described. Therefore, upon movement of the chucking handle I55, work may bechucked on the outside and upon the same movement of the handle I 55 after shifting the reverse valve "I, work may be chucked on the inside.

Since the reverse valve I60 and pipes connected.thereto do notgrotate, and sincethe turret bar 84 does" rotate, we may employ. means such as a U strap I14, which maybe secured to a We have devised means for intermittently directing coolant ontd the work in work stations and at the same time substantially completely enhousing such work so as from'spattering v In the preferred form illustrated (Figs. 2, 8, 10,20, 21), we provide a coolant pump (not shown) in the reservoir I15 which pump may be driven from a shaft I16 power from the main drive shaft 5. through bevel gears and a shaft extending down into the coolant reservoir or sump I15. v'I'he pump discharges through pipe I11 into a diversion valve casing I18 (Fig. 20) providedwith a pair of. valves I19-I80. Connected to the diversion valve casing is a return pipe. I 8 I controlled by valve. I and which returns excess coolant to the sump I15; and a coolant pipe I82 controlled by valve I19 and which leads to-a pipe I83 journalled in the frame-and carryinga U' pipe ,I84 provided I85. The pipe I88 acts as a journal for the U 1 pipe I84, and .on the pipe I 811s a lever I86 which I81 on the index shaft 8f.

is actuable by a cam Thus, with the cam I81 properly formedand 'set, the coolant pipe #185 is rocked up to the 5 chucks in position to work carried thereby at about the time the tools and work come together, and the coolant pipe I64 \is moved back away from the work when the tools'are retracted and before indexing;

In order to stop the flow of .coolant whenthe tools have been retracted, the diver sion valve I18 is employed. Beneath the valve is a. rocker I on a shaft which is actuated by a link I89 discharge coolant onto the to prevent the coolant (Fig. 8), taking its- I 60 with coolant discharge nozzles or the like I V a lever on said shaft (Fig. 2). 'I'hus,.when the coolant pipe I84 is rocked toward the chucks into position to discharge coolant onto the work,

' and nozzles I65.

the link I69 will have actuated the rocker I96 so as to liftthe valve "9 as by means. of the pin. I9I and permit the flow'of coolant from the pump discharge pipe II'I to the pipe I63-I6l As soon as the coolant pipe IIIl-is rocked back'away' from the chucks, the same link I89 serves to rock the rocker I96 and permit the valve "9 to close and at the same time open the valve I96 so that the fiuid'froin the pump discharge pipe I" is simply bypassed back into sump through pipe IBI, at! will thus be seen that coolant is automatically discharged onto the work and the coolant supply cut ofi,

' in timed relation ,witl'i the indexing and tool ing operations,

'rder to prevent spattering of coolant, the machine is provided with such conventional fixed splash guards as may be -conveniently employed,

for example, the guard I96 in Fig. 21. A movable splash housing I96 (Figs. 1, 3, 21, 22) is provided between the turret and the spindle end of the machine, which housing, if desired, may be formed in. two parts, one extending down quite closely over the front turret bar 63 and down over the work, and an outer housing portion I91-e'xtending over a part of the top of the spindle end ofthe frame so as to close the space between the spindle end, of the frame and the turret when the housing members are advanced. In the preferred 1 the housings are actuated .by and with the coolant U pipe IN. The housing member I96 may be provided with U straps I98--I9 8 which straddle the pipe I", and the housing members are therefore constrained to move with the coolant pipe Ill. The housin member I96 is preferably shaped so as to leave the upper chuck, that is. the chuck in'loading position, uncovered so that that chuck may be loaded while the work in the other two chucks issubstantially completely housed during "the times that the. work and tools are in engag'ement with each other.

As soon as the tools have finished their operations; the coolant pipe and housings are withdrawn and the turret may then index freely without danger of contact between the work pieces and the movable housing I96. As soon as the turret has been again indexed to bring a finished work piece tothe upper or loading station, the housings areagain advanced to their housing position and,'the coolant supply turned on. 'I'husjthe chuck in loading station may alwaysbe'out in the open loaded during such time as work pieces. in the work stations are being operated upon by tools;

and during such time that tooling operations are taking place, the. work in work stationsis ,completely housed and coolant thrown off by'the rotating tools will "be confined within the frame and.housings- Flyi1 1 chips will also be confined by the housings within the frame.

While the invention has been described in considerable detail and a preferred form illustratedas embodied in one particular type of 'machine,

.it is to be understood that various featuresmay' be used in connection with machines of other types and that variousparts may be used independently ,of others describedherein Various changes, f modifications, additions, and omissions maybe made within the scope of them 'vention as defined in the appended claims.

where itcan be Weclaim:

'1. In a machine of the character indicated, a

threading spindle, a rack ahd pinion for rotating "the latter in forward and reverse directions, crank means-for reciprocating-said rack, and means.

for modifying the motion imparted to said ra"ck by said crank means and cally mounted gears. v I

2. In a machine of the character indicated; a

threading spindle, a rack and pinion for rotat-.

ing 'saidspindle in forward and reverse directions, a crank for reciprocating said rack, means for adjusting the lengthof said crank, means for modifying the motion imparted to said rack by said crank, said means including means for main.-

comprising eccentri-' taining the same ratio of the running ofi to the running on times'of said threading spindle re-' gardless of the lengthlofsaid crank.

' )3. In a machine .of the character indicated,

threading spindle, means including 'a pinion for rotating the same, a reciprocable rack for drivcharacter indicated, a

threading spindle, a pinion for driving the spindle, a rack for driving said pinion, speed multiplying means between said;pinion and said threading spindle, an adiusta 1e crank for actuating said rack, thread lea er mechanism, and

means for automatically Jumping saidspindle ina to working position.

5 In a inachinepf the character indicated, a.

"threading spindle, means for rotating the same, thread leader mechanism for said spindle, and means for jumping said spindle "into, working position comprising a toggle mechanism and means for actuating said toggle mechanism.

1 6. In a machine of the character indicated, a threading spindle,. rackand pinion means for driving said spindle in forward and reverse directions, acrank for reciprocating said rack, and

means including eccentricaliy mounted gears for driving said rack and modifying the normal harmonic motion imparted to said rack by said crank, to'produce a substantially uniform movement of said rack when rotating said threading spindle in threading on direction.

'7. In a machine of the character indicated, a"

'8. In a machine of'the character indicated, a

rotatable spindle, a shift'leve'r for the same, means for suspending said shift lever fromsaid'spindle, 'a pivotally mounted fulcrum link, an adjustable fulcrum for said shift lever on said fulcrum link,

' cam means for actuating said shift lever to'feed said spindle, and means independent of said cam means for withdrawing said spindle to the same extent after each feeding movement thereof.

9. In a; machine of the character indicated, a rotatable spindle, a shift lever therefor, a movable fulcrum link, an adjustable fulcrum for said said shift lever to feed said spindle, and means independent of said cam means foralw'ays withshift lever on said link, cam meansf'or actuating j dr'awingsaid spindle to the same extent after each 'feeding movement thereof.

l0 Ina machine of the character indicated, a rotatable spindle, a shift lever for feeding the same, a pivotally mounted fulcrum link, a fulcrum for said shift lever on said link, and means carried by said shift lever for adjusting said fulcrum to vary the lever arms of said shift lever, for the purpose described.

11. In a machine of the character indicated, a turret, means for indexing the same comprising a slotted disk, a long pin to engage the slots I of said disk, means for supporting said pin on opposite sides of said disk, and means for rotating said pin about an axis parallel to the axis of indexing of said turret.

12. In a machine of the character indicated, an indexible slotted member, an index arm havingmeans to engage said slotted member, means for pivotally mounting said arm and shifting the pivotpoint of said arm toward and away from i the axis of said slotted member, a

taut from each other, an index arm having a member to sequentially engage said slots for indexing said indexible member, ineans for rotating said arm with a variable speed during indexing, and means for moving the axis of rotation of. said arm away from the axis of said indexible member during indexing.

15.In a machine of the-character indicated,

an indexible member, means forQindexing the same comprising a rotatable index arm, means for mounting said index arm upon an eccentric, ,means for rotating said eccentric to separate the axis of rotation of saidindexible. member and arm during. indexing, and means for rotating said arm.

16. In a machine of the character indicated,

an indexible member, indexing means therefor including an index arm to coact therewith, ec-

centrically mounted gears for rotating said index arm to modify the motion imparted to said indexible member by said rotating index arm, and

means for moving the axis of rotation of said arm away from and toward the axis of saidinw dexible member during indexing thereof.

17. In a machine of the character indicated, an indexible member having slots therein, a rotatable indexarm having a member to engage within said slots for indexing said turret, means for moving said member on said index arm during rotation of the latter, away from and toward the axis of said indexible member, and means for rotating said arm at variable speed during indexing.

18. In a machine of the character indicated, an indexible member having slots therein, an index arm having a member to serially engage .said slots for indexing said indexible member,

means for rotating said arm with a variable motion, and means for varying the efiective chuck carrier, a plurality of chucks carried there-.

length of said arm during indexing, said parts beingarranged to cause said arm to move at its slowest rate at substantially the time that its effective length is the shortest.

19. In a machine of the character indicated, a

turret, means for adjusting the same axlailyr means for indexing said turret comprising, an

index plate, an index pin to coact therewith for indexing said turret, means for supporting said pin comprising means at opposite sides of said index plate and spaced apart a greater distance than the adjusting range of said turret'whereby said turret may be indexed by the same means in all positions of axial adius'tment.

20. In a machine of the character indicated, anindex plate, an index pin to coact therewith, an index'arm carrying said pin, means for rotating said arm with avariable motion, an eccentric for mounting said arm, and means for rotating said eccentric at twice the s eed of said arm and in the reverse direction, for t a purpose described.

21. In a machine of the character indicated, a turret, a chuck carried thereby, means for actu ating said chuckcomprising a fluid actuated piston and cylinder, a piston rod secured to said piston and having rack teeth thereon extending into said cylinder when said piston is at one end of its stroke, a pinion engageable by said rack for rotation of said pinion, a pinion shaft, a stuffing-box about said pinion shaft, and means actuated by said pinion shaft for actuating said chuck.

22. In a machine; of the character indicated, a chuck, acylinder mounted closely adjacent there? to, anpiston in said cylinder, a piston rod extending from said cylinder, rack teeth on said piston rod and extending into said cylinder when said piston is at one end of its stroke, a pinion in engagement with'said rack, a pinion shaft for said pinion, a stuffing-box extending about said pinion shaft, the interior of said cylinder and the space about said piston rod having rack teeth and about flow of fluid through said common means.

24. In a machine of the character indicated, a chuck carrier, a. plurality of chu'cks carried there by,a fluid pressure actuating device for each of said chucks, a pressure'inlet duct for conducting pressure fluidto all of said chucks, an exhaust duct for conducting pressurefluid from all of said chucks, and means for directing pressure fluid into said exhaust duct, and, connecting said pressure fluid duct to exhaust.

' 25. In a machine of the character indicated, a chuck carrier, a plurality of chucks carried thereby, a fluid pressure actuated device for actuating each of said chucks, a fluid pressure inlet duct le ding to said chucks, a fluid pressure outlet duct leading from said chucks, a pressurepipe for normally-leading pressure fluid to said fluid pressure inlet duct, an exhaust pipe for normally leading pressure fluid from said exhaust duct,

and shiftable means for connecting said pressure pipe to said exhaust duct and said inlet duct to said exhaust pipe, for the purpose described.

26. In a machine of the character indicated, a

by, a fluid pressure actuated device for each of said chucks, a separate valve for each of said fluid pressure actuated devices for controlling the actuation thereof, an axially extending pressure fluid inlet duct, an axially extending exhaust duct, a pressure pipe, an exhaust pipe, shiftable means for normally connecting said pressure pipe to said fluid pressure inlet duct and said exhaust duct to said exhaust pipe, said shiftable means being shif-table to connect said pressure pipe to said exhaust duct and said fluid pressure inlet duct to said exhaust pipe.

a chuck carrier, a plurality of chucks carried thereby, means for indexing said chuck carrier to serially move said chucks from loading station into work station, a tool, means for moving said tool relatively to a chuck in work station,

means for discharging coolant into the work in a chuck in work station; and automatic means for discharging coolant on the work in work station upon the advance of said tool and chuck in work station.

29. In a machine of the character indicated, a chuck carrier, a chuck carried thereby, a tool, means for feeding said tool and chuck relatively to each other, a shiftable hood for said tool and chuck, a shiftable coolant conductor, means for simultaneously shifting said hood and coolant conductorin timed relation with the advance of said tool and chuck, and simultaneously directing coolant from said coolant conductor onto the work carried by said chuck.

30. In a machine of the character indicated, a chuck, a tool, means for feeding the same relatively to each other, a coolant conductor, and means for starting the flow of coolant onto work carried by said chuck and acting in timed relation with the advance of said tool and chuck.

31. In a machine of the charactenindicated. a tool, a chuck, means for feeding the same relatively to each other, a splash hood, and means acting in timed relation with the feed of said chuck and tool for. shifting said splash hood, for the purpose described. v a

32. In a machine of the character idicated', a chuck, a tool, means'for feeding the me relatively to each other,'a coolant conductor and splash hood movable simultaneously, means acting .in timed relation with the feed of said tool and chuck for directing coolant on the work carried byv said chuck and covering said work by said splash hood.

33. In a machine of the character indicated,

a chuck, a tool, means for feeding the same relatively to each other, a coolant conducting means, valve means for controlling the discharge of coolant onto the work carried by said chuck, and means including said valve means and acting in timed relation with the feed of said tool and chuck for controlling the flow of coolant to the work.

34." In a machine of the character indicated. a chuck carrier, a plurality of chucks carried thereby and indexible from station to station, means to act on work carried .by said chucks, a coolant discharge pipe and a splash hood movdescribed.

able simultaneously, valve means for controlling the flowoi' fluid in said coolant pipe, and means for moving said coolant pipe and hood into working position and initiating the flow of fluid through said coolant pipe.

35. In a chucking machine, an indexible chuck carrier, a plurality of chucks carried thereby and indexible from loading station to work station,

a splash hood shaped to enhouse chucks in work station and leave each chuck when in loading station free, means acting in timed relation with the indexing of said carrier to move said hood back to permit indexing and to move said hood to enhousing position between indexes, and means for discharging coolant on work carried by a chuck'ln work station.

36. In a. machine of the character indicated, a

threading spindle, a'pinion andtoothed member meshing therewith for. driving said spindle, means for oscillating said toothed member for driving said pinion in forward and reverse directions and including eccentrically mounted gears.-

37. In a machine of the character indicated, a

threading spindle, a gear and a toothed member'- meshing with said gear for driving said spindle, a crank for oscillating said toothed member to cause said gear to rotate in forward and reverse directions, and means including eccentrically mounted gears for'driving said crank, for the purpose described.

38. In a machine of the character indicated, a threading spindle, a pinionfor driving said spindle, a toothed member meshing with said pinion for driving the latter, a crank including a crank pin for oscillating said toothed member to drive said pinion in forward and reverse directions,

.and means for supporting said crank pin on said crank in selective positions on opposite sides of a plane in the axis of said crank, for the purpose.

-39. In a machine of the character indicated, a threading spindle, a pinion for driving said spin- .dle, a toothed member meshing with said pinion for driving the latter, a crank including a crank pin for oscillating said toothed member to drive said pinion'in forward and reverse directions, means for supporting said crank pin in selective positions on opposite sides of a plane in the axis of said crank for the purpose described, and means including eccentrically mounted gears for driving said crank, for the purpose described.

40. In a machine of the character indicated, a pinion, a toothed member meshing therewith and normally lying on one side of the axis thereof for driving said pinion, a crank including a crank pin member thereon for oscillating said toothed member to rotate said pinion in forward and reverse direction, and means for holding one of said members on either/side of the axis of its coasting part, for the purpose described.

41. In a deviceof thecharacter indicated, an index plate, an index' arm having a roll to coact' with slots of said plate, and means for driving said arm including means to vary the path of movement of said roll to cause it to enter and leave said slots in a direction normal to the axis of said index plate and to cause'said roll to move away from the axis of indexing of said plate and move with diminished indexing speed at the center of the indexing movement of said'plate.

ROBERT S. BROWNZ P. SMITH. 

